    //关闭等待窗口
    function closediv() {
        //Close Div
        document.body.removeChild(document.getElementById("bgDiv"));
        document.getElementById("msgDiv").removeChild(document.getElementById("msgTitle"));
        document.body.removeChild(document.getElementById("msgDiv"));
    }
    //显示等待窗口
    function showdiv(str) {
        var msgw, msgh, bordercolor;
        msgw = 400; //提示窗口的宽度
        msgh = 100; //提示窗口的高度
        bordercolor = "#336699"; //提示窗口的边框颜色
        titlecolor = "#99CCFF"; //提示窗口的标题颜色

        var sWidth, sHeight;
        sWidth = window.screen.availWidth;
        sHeight = window.screen.availHeight;

        var bgObj = document.createElement("div");
        bgObj.setAttribute('id', 'bgDiv');
        bgObj.style.position = "absolute";
        bgObj.style.top = "0";
        bgObj.style.background = "#777";
        bgObj.style.filter = "progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
        bgObj.style.opacity = "0.6";
        bgObj.style.left = "0";
        bgObj.style.width = sWidth + "px";
        bgObj.style.height = sHeight + "px";
        document.body.appendChild(bgObj);
        var msgObj = document.createElement("div")
        msgObj.setAttribute("id", "msgDiv");
        msgObj.setAttribute("align", "center");
        msgObj.style.position = "absolute";
        msgObj.style.background = "white";
        msgObj.style.font = "12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
        msgObj.style.border = "1px solid " + bordercolor;
        msgObj.style.width = msgw + "px";
        msgObj.style.height = msgh + "px";
        msgObj.style.top = (document.documentElement.scrollTop + (sHeight - msgh) / 2) + "px";
        msgObj.style.left = (sWidth - msgw) / 2 + "px";
        var title = document.createElement("h4");
        title.setAttribute("id", "msgTitle");
        title.setAttribute("align", "right");
        title.style.margin = "0";
        title.style.padding = "3px";
        title.style.background = bordercolor;
        title.style.filter = "progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
        title.style.opacity = "0.75";
        title.style.border = "1px solid " + bordercolor;
        title.style.height = "18px";
        title.style.font = "12px Verdana, Geneva, Arial, Helvetica, sans-serif";
        title.style.color = "white";
        document.body.appendChild(msgObj);
        document.getElementById("msgDiv").appendChild(title);
        var txt = document.createElement("p");
        txt.style.margin = "1em 0"
        txt.setAttribute("id", "msgTxt");
        txt.innerHTML = str;
        document.getElementById("msgDiv").appendChild(txt);
    }
    //屏蔽F5
    document.onkeydown = mykeydown;
    function mykeydown() {
        if (event.keyCode == 116) //屏蔽F5刷新键
        {
            window.event.keyCode = 0;
            return false;
        }
    }
    //用来记录要显示的DIV的ID值
    var EV_MsgBox_ID=""; //重要

    //弹出对话窗口(msgID-要显示的div的id)
    function EV_modeAlert(msgID){
        //创建大大的背景框
        var bgObj=document.createElement("div");
        bgObj.setAttribute('id','EV_bgModeAlertDiv');
        document.body.appendChild(bgObj);
        //背景框满窗口显示
        EV_Show_bgDiv();
        //把要显示的div居中显示
        EV_MsgBox_ID=msgID;
        EV_Show_msgDiv();
    }

    //关闭对话窗口
    function EV_closeAlert(){
        var msgObj=document.getElementById(EV_MsgBox_ID);
        var bgObj=document.getElementById("EV_bgModeAlertDiv");
        msgObj.style.display="none";
        document.body.removeChild(bgObj);
        EV_MsgBox_ID="";
    }

    //窗口大小改变时更正显示大小和位置
    window.onresize=function(){
        if (EV_MsgBox_ID.length>0){
            EV_Show_bgDiv();
            EV_Show_msgDiv();
        }
    }

    //窗口滚动条拖动时更正显示大小和位置
    window.onscroll=function(){
        if (EV_MsgBox_ID.length>0){
            EV_Show_bgDiv();
            EV_Show_msgDiv();
        }
    }

    //把要显示的div居中显示
    function EV_Show_msgDiv(){
        var msgObj   = document.getElementById(EV_MsgBox_ID);
        msgObj.style.display  = "block";
        var msgWidth = msgObj.scrollWidth;
        var msgHeight= msgObj.scrollHeight;
        var bgTop=EV_myScrollTop();
        var bgLeft=EV_myScrollLeft();
        var bgWidth=EV_myClientWidth();
        var bgHeight=EV_myClientHeight();
        var msgTop=bgTop+Math.round((bgHeight-msgHeight)/2);
        var msgLeft=bgLeft+Math.round((bgWidth-msgWidth)/2);
        msgObj.style.position = "absolute";
        msgObj.style.top      = msgTop+"px";
        msgObj.style.left     = msgLeft+"px";
        msgObj.style.zIndex   = "10001";

    }
    //背景框满窗口显示
    function EV_Show_bgDiv(){
        var bgObj=document.getElementById("EV_bgModeAlertDiv");
        var bgWidth=EV_myClientWidth();
        var bgHeight=EV_myClientHeight();
        var bgTop=EV_myScrollTop();
        var bgLeft=EV_myScrollLeft();
        bgObj.style.position   = "absolute";
        bgObj.style.top        = bgTop+"px";
        bgObj.style.left       = bgLeft+"px";
        bgObj.style.width      = bgWidth + "px";
        bgObj.style.height     = bgHeight + "px";
        bgObj.style.zIndex     = "10000";
        bgObj.style.background = "#777";
        bgObj.style.filter     = "progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=60,finishOpacity=60);";
        bgObj.style.opacity    = "0.6";
    }
    //网页被卷去的上高度
    function EV_myScrollTop(){
        var n=window.pageYOffset
        || document.documentElement.scrollTop
        || document.body.scrollTop || 0;
        return n;
    }
    //网页被卷去的左宽度
    function EV_myScrollLeft(){
        var n=window.pageXOffset
        || document.documentElement.scrollLeft
        || document.body.scrollLeft || 0;
        return n;
    }
    //网页可见区域宽
    function EV_myClientWidth(){
        var n=document.documentElement.clientWidth
        || document.body.clientWidth || 0;
        return n;
    }
    //网页可见区域高
    function EV_myClientHeight(){
        var n=document.documentElement.clientHeight
        || document.body.clientHeight || 0;
        return n;
    }